Chemistry 9701/06 May June 2002 | Cambridge AS Level Past Papers With Mark Scheme

1. Protein Structure and Denaturation: Understanding the tertiary structure of globular proteins, the types of interactions between R groups (e.g., hydrophobic forces, disulphide linkages), and how these interactions are disrupted by heat, metal ions, and pH changes.
2. DNA Structure and Function: Explaining the structure of DNA, its role in protein synthesis, and how it codes genetic information for cellular functions.
3. Environmental Chemistry: Discussing the role of sulfur dioxide in the greenhouse effect, its conversion into sulfate ions, and how it contributes to acid rain. Also exploring industrial methods of removing sulfur from coal.
4. Calcium in Soil and Water: Investigating the weathering process of calcium-containing rocks, the role of calcium carbonate in neutralizing soil acidity, and how liming helps maintain soil pH for agricultural use.
5. Solubility and Phase Equilibria: Analyzing the solubility of potassium chloride at different temperatures, plotting solubility curves, and using mole fractions to calculate concentrations. Also discussing the phase diagram for water and KCl.
6. Distillation and Solubility: Examining how distillation is used to separate compounds with different boiling points, and explaining solubility differences in organic compounds.
7. Spectroscopy and Mass Spectrometry: Using IR, NMR, and mass spectrometry to identify functional groups in organic compounds, including methods for distinguishing between drugs and analyzing molecular structures.